[go: up one dir, main page]

US7350952B2 - Illumination system and display device using the same - Google Patents

Illumination system and display device using the same Download PDF

Info

Publication number
US7350952B2
US7350952B2 US11/378,242 US37824206A US7350952B2 US 7350952 B2 US7350952 B2 US 7350952B2 US 37824206 A US37824206 A US 37824206A US 7350952 B2 US7350952 B2 US 7350952B2
Authority
US
United States
Prior art keywords
reflector
leds
sets
light
sub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
US11/378,242
Other languages
English (en)
Other versions
US20060221619A1 (en
Inventor
Eitaro Nishigaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hannstar Display Corp
Original Assignee
NEC LCD Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC LCD Technologies Ltd filed Critical NEC LCD Technologies Ltd
Assigned to NEC LCD TECHNOLOGIES, LTD. reassignment NEC LCD TECHNOLOGIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NISHIGAKI, EITARO
Assigned to NEC LCD TECHNOLOGIES, LTD. reassignment NEC LCD TECHNOLOGIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NISHIGAKI, EITARO
Publication of US20060221619A1 publication Critical patent/US20060221619A1/en
Application granted granted Critical
Publication of US7350952B2 publication Critical patent/US7350952B2/en
Assigned to NEC CORPORATION reassignment NEC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NEC LCD TECHNOLOGIES, LTD.
Assigned to GOLD CHARM LIMITED reassignment GOLD CHARM LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NEC CORPORATION
Assigned to HANNSTAR DISPLAY CORPORATION reassignment HANNSTAR DISPLAY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GOLD CHARM LIMITED
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/043—Refractors for light sources of lens shape the lens having cylindrical faces, e.g. rod lenses, toric lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array

Definitions

  • the present invention relates to an illumination system and a display device using the same and more particularly, to an illumination system comprising Light-Emitting Diodes (LEDs) as point light sources, and a display device such as a Liquid-Crystal Display (LCD) device using the illumination system.
  • LEDs Light-Emitting Diodes
  • LCD Liquid-Crystal Display
  • the invention is preferably applied to a backlight unit of a LCD device; however, it is applicable to any other display device than the LCD device if it comprises plural sets of LEDs whose colors of emitted light are different.
  • the LCD device has been extensively used for various devices and systems, such as Office Automation (OA) apparatuses, Audio-Visual (AV) apparatuses, portable information or communication terminals and so on, because of its characters such as compactness, thinness, and low power-consumption.
  • the LCD device comprises as its main components a LCD panel having a pair of opposing transparent substrates and a liquid crystal layer interposed between the substrates, and a backlight unit for generating backlight illuminating the panel.
  • the liquid crystal layer is controlled in such a way as to adjust the transmittance or transmitting quantity of light emitted from the backlight unit, thereby displaying images on the screen.
  • the backlight unit comprises a fluorescent lamp or lamps as its light source.
  • peripheral circuits such as an inverter circuit are required.
  • the inverter circuit makes noises. Therefore, recently, it is popular to use LEDs instead of the fluorescent lamp or lamps.
  • the backlight unit comprises plural sets of LEDs arranged in a predetermined manner, where each set of LEDs emit red (R), green (G) or blue (B) light.
  • R red
  • G green
  • B blue
  • the red, green and blue light emitted from the respective LEDs are then mixed together to generate white light.
  • color irregularity is likely to occur on the display screen due to the arrangement or layout of the LEDs occurs.
  • this prior-art linear light source comprises a set of LEDs 110 a serving as point light sources 110 , a diffusing plate 111 , and a light guide plate 112 .
  • the diffusing plate 111 receives the light emitted from the LEDs 110 a .
  • the light guide plate 112 receives the light from the diffusing plate 111 and emits light from a flat surface of the plate 112 .
  • the LEDs 110 a are arranged along a straight line at equal intervals P in parallel to a diffusing plate 111 , as shown in FIG. 1A .
  • the LEDs 110 a are apart from the diffusing plate 111 at a distance L, as shown in FIG. 1B .
  • the interval P and the distance L have a predetermined relationship, thereby generating approximately uniform luminance distribution.
  • the present invention was created in consideration of the above-described problems.
  • a main object of the present invention is to provide an illumination system that makes it possible to generate light with less color irregularity with a simple structure while restraining the increase of size, and a display device equipped with the illumination system.
  • an illumination system which comprises
  • a tube-shaped reflector having a tube-shaped wall whose inner surface is reflective, the wall including an aperture extending along a longitudinal axis of the reflector;
  • a collecting lens fixed to the reflector in such a way as to fill the aperture of the reflector.
  • a tube-shaped reflector having a tube-shaped wall whose inner surface is reflective is provided.
  • the wall includes an aperture extending along a longitudinal axis of the reflector.
  • Plural sets of LEDs are arranged in the reflector, colors of light to be emitted from the LEDs in each of the sets being different.
  • the LEDs in each of the sets are arranged along the longitudinal axis of the reflector to form a linear light source.
  • a collecting lens is fixed to the reflector in such a way as to fill the aperture of the reflector. Therefore, the light emitted from the respective LEDs can be repeatedly reflected by the inner surface of the reflector and as a result, the light can be sufficiently mixed together to thereby generate white light. This means that white light with less color irregularity is realizable with a simple structure while restraining the increase of size of the illumination apparatus.
  • a cross section of the reflector along a plane perpendicular to the longitudinal axis is approximately circular, elliptical, or polygonal.
  • the inner surface of the reflector has surface irregularities. This is because diffused reflection of the light from the LEDs is enhanced.
  • the LEDs in the respective sets may be arranged along the longitudinal axis at approximately equal or unequal intervals. Moreover, the LEDs in the respective sets may be arranged along a circumferential direction of the reflector at approximately equal or unequal distances.
  • the LEDs in the respective sets may be simply located directly on the inner surface of the reflector. However, it is preferred that the LEDs in each of the sets are located on a base, where the bases are fixed onto the inner surface of the reflector at intervals along a circumferential direction of the reflector.
  • a sub-reflector is additionally provided.
  • the sub-reflector is fixed to the reflector and extended along the longitudinal axis of the reflector.
  • the sub-reflector is located in such a way as to shield or block the light emitted from the LEDs toward the collecting lens.
  • the reflection frequency of the light can be increased furthermore and the light from the LEDs toward the collecting lens can be shielded or blocked.
  • the effect of reducing the color irregularity is enhanced, which means that the color irregularity is further improved.
  • sub-reflector has an approximately flat, V-shaped, or arc-shaped cross section along a plane perpendicular to the longitudinal axis.
  • the sub-reflector has surface irregularities. This is because diffused reflection of the light from the LEDs is enhanced.
  • the sub-reflector is apart from the inner surface of the reflector. This is because the light from the LEDs toward the collecting lens is efficiently blocked.
  • sub-reflectors are additionally provided for the respective sets of LEDs.
  • the sub-reflectors are fixed to the reflector and extended along the longitudinal axis of the reflector.
  • Each of the sub-reflectors is located in such a way as to shield or block the light emitted from the LEDs in the corresponding one of the sets toward the collecting lens.
  • the effect of reducing the color irregularity is further enhanced with respect to the above-described embodiment.
  • At least one of the sub-reflectors has an approximately flat, V-shaped, or arc-shaped cross section along a plane perpendicular to the longitudinal axis.
  • At lease one of the sub-reflectors has surface irregularities. This is because diffused reflection of the light from the LEDs is enhanced.
  • the sub-reflectors are apart from the inner surface of the reflector. This is because the light from the LEDs toward the collecting lens is efficiently blocked.
  • the LEDs in a first one of the sets emit red light
  • the LEDs in a second one of the sets emit green light
  • the LEDs in a third one of the sets emit blue light.
  • a display device which comprises one of the illumination systems as described above; a light guide plate having an input end located to confront with the collecting lens of the illumination system; and a display panel located to confront with an output end of the light guide plate.
  • the illumination system according to the first aspect of the invention is included. Therefore, display quality of the display device can be enhanced or improved.
  • an LCD panel is included as the display panel, and the illumination system is included as a backlight unit for the LCD panel.
  • FIG. 1A is a schematic perspective view showing the structure of a prior-art linear light source.
  • FIG. 1B is a schematic plan view showing the arrangement of the LEDs, the diffusing plate, and the light guide plate of the prior-art linear light source of FIG. 1A .
  • FIG. 2A is a schematic cross-sectional view of an illumination system according to a first embodiment of the invention, in which a light guide plate and a LCD panel are additionally shown.
  • FIG. 2B is a schematic rear view of the illumination system according to the first embodiment of the invention, which is seen in the direction A in FIG. 2A .
  • FIG. 3 is a schematic exploded perspective view showing an assembling manner of the illumination system according to the first embodiment of the invention, where the first LEDs, second LEDs, and third LEDs are respectively fixed on their bases.
  • FIG. 4A is a schematic cross-sectional view of an illumination system according to a variation example of the first embodiment of the invention, where the arrangement of the LEDs are different from that of FIGS. 1A and 1B .
  • FIG. 4B is a schematic rear view of the illumination system according to the variation example of the first embodiment of the invention, which is seen in the direction A in FIG. 2A .
  • FIG. 5A is a schematic cross-sectional view of an illumination system according to another variation example of the first embodiment of the invention, where the cross-sectional shape of the reflector is elliptical.
  • FIG. 5B is a schematic cross-sectional views of an illumination system according to still another variation example of the first embodiment of the invention, where the cross-sectional shape of the reflector is polygonal.
  • FIG. 5C is a schematic cross-sectional view of an illumination system according to a further variation example of the first embodiment of the invention, where the cross-sectional shape of the reflector is approximately circular and the wall of the reflector is waved to form surface irregularities on its inner and outer surfaces.
  • FIG. 6A is a schematic cross-sectional view of an illumination system according to a second embodiment of the invention, in which a light guide plate and a LCD panel are additionally shown.
  • FIG. 6B is a schematic rear view of the illumination system according to the second embodiment of the invention, which is seen in the direction A in FIG. 6A .
  • FIG. 7 is a schematic exploded perspective view showing an assembling manner of the illumination system according to the second embodiment of the invention, where a sub-reflector is additionally provided in the reflector.
  • FIG. 8A is a schematic cross-sectional view of an illumination system according to a variation example of the second embodiment of the invention, where the sub-reflector has a V-shaped cross-section.
  • FIG. 8B is a schematic cross-sectional view of an illumination system according to another variation example of the second embodiment of the invention, where three sub-reflectors are provided for the first, second, and third LEDs.
  • FIG. 8C is a schematic cross-sectional view of an illumination system according to still another variation example of the second embodiment of the invention, where the sub-reflector has an arc-shaped cross section and is waved to form surface irregularities on its both surfaces.
  • FIG. 9 is a schematic cross-sectional view of an illumination system according to a further variation example of the second embodiment of the invention, where the sub-reflector has a flat cross-section.
  • an illumination system comprising red-, green-, and blue-light emitting LEDs as point light sources
  • color irregularity is likely to occur in the light guide plate due to the arrangement or layout of the LEDs.
  • the distance between the point light sources (i.e., LEDs) and the diffusing plate may be increased, as previously explained with reference to FIGS. 1A and 1B .
  • this measure arises another problem that the size of the illumination system is increased and the luminance is lowered.
  • respective LEDs may be controlled separately.
  • many power supplies and many control circuits are required for lighting the LEDs, which arises another problem that the structure is complicated and the price is raised.
  • a tube-shaped reflector having a tube-shaped wall whose inner surface is reflective is provided.
  • the wall includes an aperture extending along a longitudinal axis of the reflector.
  • plural sets of LEDs are arranged, where colors of light to be emitted from the LEDs in each of the sets are different. For example, red, green, or blue LEDs are used for each set.
  • the LEDs in each of the sets are arranged along the longitudinal axis of the reflector to form a linear light source.
  • a collecting lens e.g., a bar-shaped lens
  • the light from the respective LEDs which include different colors, will be repeatedly reflected by the inner surface of the reflector and mixed, and finally collected by the collecting lens. Thereafter, the light from the collecting lens is traveled or irradiated to the input end of the light guide plate. As a result, white light with less color irregularity is obtainable.
  • FIGS. 2A , 2 B and 3 An illumination system and a LCD device according to a first embodiment of the invention will be explained with reference to FIGS. 2A , 2 B and 3 .
  • the illumination system comprises a cylindrical reflector or reflection member 2 having an aperture or slit 7 , a first set of LEDs 3 , a second set of LEDs 4 , a third set of LEDs 5 , and a bar-shaped collecting lens 1 .
  • the aperture or slit 7 extends along the longitudinal axis of the reflector 2 .
  • the collecting lens 1 is fixed to the reflector 2 to close the aperture 7 .
  • the lens 1 is parallel to the longitudinal axis of the reflector 2 .
  • two end plates are fixed to the approximately circular openings of the reflector 2 at its right and left ends.
  • the inner surfaces of the end plates are formed reflective.
  • the first, second and third sets of LEDs 3 , 4 , and 5 emit light of different colors, e.g., red, green, and blue. These LEDs 3 , 4 , and 5 are arranged on the curved inner surface of the reflector 2 in such a way as to be oriented toward the central, longitudinal axis of the reflector 2 .
  • the LEDs 3 in the first set are arranged linearly along the longitudinal axis of the reflector 2 .
  • the LEDs 4 in the second set and the LEDs 5 in the third set are arranged linearly along the longitudinal axis of the reflector 2 , respectively. Therefore, the LEDs 3 , 4 , and 5 are parallel to the collecting lens 1 .
  • a light guide plate 8 is located in parallel to the collecting lens 1 of the illumination system. Thus, the LEDs 3 , 4 , and 5 are also in parallel to the light guide plate 8 .
  • the light guide plate 8 serves as a planar light source. The plate 8 receives the incident light entering by way of the input end 9 and emits illumination light by way of its output surface, thereby illuminating an LCD panel 70 confronted with the output surface of the plate 8 .
  • the reflector 2 may be formed by processing a metal plate or plates (e.g., an aluminum plate) or by forming a metal film on the inner surface of a molded cylindrical plastic.
  • the aperture or slit 7 may be formed by splitting the cylindrical wall of the reflector 2 or by cutting an elongated part of the cylindrical wall of the reflector 2 away.
  • the cross-sectional shape of the reflector 2 in the plane perpendicular to the longitudinal axis of the reflector 2 is approximately circular.
  • the cross-sectional shape of the reflector 2 is not limited to this.
  • the cross-sectional shape of the reflector 2 may be elliptical, as shown in FIG. 5A , or polygonal, as shown in FIG. 5B .
  • the inner surface of the reflector 2 may be formed like a mirror surface.
  • the cylindrical wall itself of the reflector 2 or its inner surface may be waved or roughened to form minute surface irregularities or bumpiness, as shown in FIG. 5C .
  • the surface irregularities or bumpiness may be formed on only the inner surface of the reflector 2 .
  • the arrangement of the sets of LEDs 3 , 4 , and 5 is not limited to that shown in FIGS. 2A and 2B .
  • the LED arrangement may be changed according to the luminance and/or emission spectrum of the respective LEDs 3 , 4 , or 5 .
  • the first, second, and third sets of LEDs 3 , 4 , or 5 may be arranged on the inner surface of the reflector 2 in such a way as to equally divide the arc-shaped circumference of the reflector 2 , as shown in FIG. 2A .
  • the distance between the first and second sets of LEDs 3 and 4 may be equal to the distance between the second and third sets of LEDs 4 and 5 , as shown in FIG. 2A .
  • first and third sets of LEDs 3 and 5 are arranged symmetrically with respect to the second set of LEDs 4 .
  • these LEDs 3 , 4 and 5 may be arranged asymmetrically, for example, by shifting the first set of LEDs 3 toward the second set of LEDs 4 along the inner surface of the reflector 2 , as shown in FIG. 4A .
  • the distance between the first and second sets of LEDs 3 and 4 is smaller than the distance between the second and third sets of LEDs 4 and 5 .
  • the intervals of the LEDs 3 , 4 , or 5 along the longitudinal axis of the reflector 2 are equal in the structure of FIG. 2B according to the first embodiment, they may be changed.
  • the intervals of the LEDs 4 may be different from those of the LEDs 3 and 5 , as shown in FIG. 4B .
  • the intervals of the LEDs 4 are smaller than the intervals of the LEDs 3 and 5 , where the intervals of the LEDs 3 and 5 are equal.
  • the fixing structure of the LEDs 3 , 4 , and 5 onto the inner surface of the reflector 2 is not limited to those shown here.
  • holes may be formed through the wall of the reflector 2 and the LEDs 3 , 4 , and 5 may be respectively inserted into the holes and fixed in these positions.
  • the LEDs 3 , 4 , and 5 may be respectively fixed on their bases 30 , 40 and 50 , as shown in FIG. 3 and thereafter, the bases 30 , 40 and 50 may be secured to the inner surface of the reflector 2 in its inside.
  • each of the LEDs 3 , 4 , and 5 has directivity, it is preferred that the optical axis of each of the LEDs 3 , 4 , and 5 is oriented toward the central axis of the reflector 2 .
  • the optical axis may be somewhat deviated from the central axis, which results in no problem.
  • the lens 1 has a function of collecting the light emitted from the LEDs 3 , 4 , and 5 and reflected by the inner surface of the reflector 2 and of emitting the light thus collected toward the light guide plate 8 .
  • the shape of the lens 1 is optionally changeable if the lens 1 is fixed to the reflector 2 to block the whole aperture 7 .
  • the lens 1 may be formed by a single lens or a set of assembled lenses.
  • the fixing structure of the collecting lens 1 to the reflector 2 is not limited.
  • a pair of guides 21 and 22 may be respectively formed on the opposing edges of the reflector 2 near the aperture 7 and then, the lens 1 may be sandwiched and fixed by the guides 21 and 22 , as shown in FIGS. 2A and 2B .
  • the light emitted from the third set of LEDs 5 is reflected by the inner surface of the reflector 2 plural times (twice in FIG. 2A ) to enter the collecting lens 1 . Thereafter, the light penetrates through the lens 1 to enter the light guide plate 8 by way of its input end 9 .
  • the light emitted from the first set of LEDs 3 and the second set of LEDs 4 is reflected by the inner surface of the reflector 2 plural times to enter the collecting lens 1 . Thereafter, the light penetrates through the lens 1 to enter the light guide plate 8 by way of its input end 9 .
  • the light color of the first set of LEDs 3 is red
  • the light color of the second set of LEDs 4 is green
  • the light color of the third set of LEDs 5 is blue. Then, the red, green, and blue light from these LEDs 3 , 4 , and 5 are sufficiently mixed together in the cylindrical reflector 2 , thereby generating white light with less color irregularity.
  • the white balance can be varied and therefore, desired white balance can be obtained.
  • the tube-shaped reflector 2 having the tube-shaped wall whose inner surface is reflective is provided.
  • the wall includes the elongated aperture 7 extending along the longitudinal axis of the reflector 2 .
  • the first, second, and third sets of LEDs 3 , 4 , and 5 that emit different color of light are arranged at the predetermined distances along the circumferential direction of the reflector 2 .
  • the LEDs 3 , 4 , and 5 are arranged along the longitudinal axis of the reflector 2 to form linear light sources.
  • the bar-shaped collecting lens 1 is fixed to the reflector 2 in such a way as to fill or block the aperture 7 .
  • the light emitted from the respective LEDs 3 , 4 , and 5 can be repeatedly reflected on the inner surface of the reflector 2 and as a result, the light can be sufficiently mixed together in the reflector 2 and collected by the collecting lens 1 , thereby generating white light.
  • white light with less color irregularity is realizable with a simple structure while restraining the increase of size of the illumination system.
  • the illumination system according to the first embodiment may be used as the backlight unit of a LCD device.
  • the LCD device comprises the said illumination system as the backlight unit, the light guide plate 8 , and the LCD panel 70 . Since the illumination system according to the first embodiment is used as the backlight unit, the display quality of the LCD device is improved.
  • FIGS. 6A , 6 B and 7 an illumination system and a LCD device according to a second embodiment of the invention will be explained with reference to FIGS. 6A , 6 B and 7 .
  • the light emitted from the respective LEDs 3 , 4 , and 5 is repeatedly reflected on the inner surface of the reflector 2 prior to entering the collecting lens 1 .
  • This means that the light is reflected by the reflector 2 only.
  • a tape-shaped sub-reflector or a sub-reflection member 6 is additionally provided. This is based on the consideration about the fact that the more the reflection frequency of the light, the higher the mixing uniformity of colors.
  • the illumination system according to the second embodiment is the same in configuration as the illumination system according to the first embodiment except that the sub-reflector 6 is additionally provided.
  • the system comprises the cylindrical reflector 2 having the aperture 7 , the first set of LEDs 3 , the second set of LEDs 4 , the third set of LEDs 5 , the bar-shaped collecting lens 1 , and the sub-reflector 6 .
  • the collecting lens 1 is fixed to the reflector 2 to close the aperture 7 .
  • the sub-reflector 6 has an arc-shaped cross section and extends along the longitudinal axis of the reflector 2 .
  • the sub-reflector 6 is fixed onto the inner surface of the reflector 2 in such a way that the light from the second set of LEDs 4 does not reach directly the collecting lens 1 .
  • the sub-reflector 6 may have an optical reflection function on its each surface.
  • the sub-reflector 6 may be formed by processing a metal plate (e.g., an aluminum plate) or by forming a metal film on the inner surface of a molded tape-shaped plastic.
  • the fixing structure of the sub-reflector 6 onto the inner surface of the reflector 2 is not limited.
  • a pair of columns 60 may be formed on the sub-reflector 6 at its ends and thereafter, the sub-reflector 6 may be fixed on the inner surface with the columns or short bars 60 .
  • the sub-reflector 6 may be fixed to the circular right and left end plates (not shown in FIG. 7 ) of the reflector 2 at its both ends.
  • both of the longer side edges of the sub-reflector 6 are not contacted with the inner wall of the reflector 2 in FIG. 6A , one of the longer side edges of the sub-reflector 6 may be contacted with the inner wall.
  • the cross-section of the sub-reflector 6 in a plane perpendicular to the longitudinal axis of the reflector 2 is arc-shaped in the structure of FIGS. 6A and 7
  • the cross-sectional shape of the sub-reflector 6 may be determined optionally according to the necessity.
  • the cross-sectional shape of the sub-reflector 6 may be flat, in other words, the sub-reflector 6 may be formed by an elongated flat plate, as shown in FIG. 9 .
  • the cross-section of the sub-reflector 6 may be V-shaped, as shown in FIG. 8A .
  • the sub-reflector 6 is located to confront with the collecting lens 1 in the reflector 2 , thereby preventing the light from the second set of LEDs 4 from directly reaching the collecting lens 1 .
  • three sub-reflectors 6 may be provided in the reflector 2 in such a way as to confront with the first, second, and third sets of LEDs 3 , 4 , and 5 , respectively, thereby preventing the light from the respective sets of LEDs 3 , 4 , and 5 from directly reaching the collecting lens 1 .
  • the whole surface of the sub-reflector 6 may be formed like a mirror surface.
  • the sub-reflector 6 itself or the inner and outer surfaces of the sub-reflector 6 may be waved or roughened to form minute surface irregularities or bumpiness, as shown in FIG. 8C .
  • the surface irregularities or bumpiness may be formed on only the surfaces of the sub-reflector 6 .
  • the light emitted from the second set of LEDs 4 is reflected by the inner surface of the reflector 2 and the outer surface of the sub-reflector 6 plural times (five times in FIG. 6A ) to enter the collecting lens 1 . Thereafter, the light penetrates through the lens 1 to enter the light guide plate 8 by way of its input end 9 .
  • the light emitted from the first set of LEDs 3 and the third set of LEDs 5 is reflected by the inner surface of the reflector 2 and the inner or outer surface of the sub-reflector 6 plural times to enter the collecting lens 1 . Thereafter, the light penetrates through the lens 1 to enter the light guide plate 8 by way of its input end 9 .
  • the light color of the first set of LEDs 3 is red
  • the light color of the second set of LEDs 4 is green
  • the light color of the third set of LEDs 5 is blue. Then, the red, green, and blue light from these LEDs 3 , 4 , and 5 are sufficiently mixed together in the cylindrical reflector 2 with the help of the sub-reflector 6 , thereby generating white light with still less color irregularity.
  • the white balance can be varied and therefore, desired white balance can be obtained.
  • the tube-shaped reflector 2 having the tube-shaped wall whose inner surface is reflective is provided.
  • the wall includes the aperture 7 extending along the longitudinal axis of the reflector 2 .
  • the first, second, and third sets of LEDs 3 , 4 , and 5 that emit different color of light are arranged and at the same time, the sub-reflector 6 is provided in the reflector 2 .
  • the LEDs 3 , 4 , and 5 are arranged along the longitudinal axis of the reflector 2 to form linear light sources.
  • the bar-shaped collecting lens 1 is fixed to the reflector 2 in such a way as to fill or block the aperture 7 .
  • the light emitted from the respective LEDs 3 , 4 , and 5 can be repeatedly reflected on the inner surface of the reflector 2 and the inner and outer surfaces of the sub-reflector 6 more times than the first embodiment.
  • the light can be more sufficiently mixed together to thereby generate white light. This means that white light with still less color irregularity is realizable with a simple structure while restraining the increase of size of the illumination system.
  • the illumination system according to the second embodiment is used as the backlight unit of a LCD device, the display quality of the LCD device is improved furthermore compared with the first embodiment.
  • red, green, and blue LEDs are used in combination.
  • white light can be generated by two colors of light from two sets of LEDs, two sets of LEDs may be used for the invention.
  • white light can be generated by four or more colors of light from four or more sets of LEDs, four or more sets of LEDs may be used for the invention.
  • the invention is applied to an illumination system where the light from the first, second, and third sets of LEDs is mixed to generate white light in the above-described embodiments and variation examples.
  • the invention is applicable to an illumination system for illuminating any color of light other than white light.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Liquid Crystal (AREA)
  • Led Device Packages (AREA)
US11/378,242 2005-04-04 2006-03-20 Illumination system and display device using the same Active US7350952B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005107475A JP4404799B2 (ja) 2005-04-04 2005-04-04 照明装置及び該照明装置を備える液晶表示装置
JP107475/2005 2005-04-04

Publications (2)

Publication Number Publication Date
US20060221619A1 US20060221619A1 (en) 2006-10-05
US7350952B2 true US7350952B2 (en) 2008-04-01

Family

ID=37070161

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/378,242 Active US7350952B2 (en) 2005-04-04 2006-03-20 Illumination system and display device using the same

Country Status (5)

Country Link
US (1) US7350952B2 (ja)
JP (1) JP4404799B2 (ja)
KR (1) KR100807605B1 (ja)
CN (1) CN100526953C (ja)
TW (1) TWI339296B (ja)

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070217216A1 (en) * 2006-03-19 2007-09-20 Kazuhiro Goto Light pipe providing wide illumination angle
US20080158908A1 (en) * 2006-12-28 2008-07-03 Chunghwa Picture Tubes, Ltd. Backlight module
US20090161359A1 (en) * 2007-12-21 2009-06-25 Altair Engineering, Inc. Light distribution using a light emitting diode assembly
US7938562B2 (en) 2008-10-24 2011-05-10 Altair Engineering, Inc. Lighting including integral communication apparatus
US7946729B2 (en) 2008-07-31 2011-05-24 Altair Engineering, Inc. Fluorescent tube replacement having longitudinally oriented LEDs
US7976196B2 (en) 2008-07-09 2011-07-12 Altair Engineering, Inc. Method of forming LED-based light and resulting LED-based light
US20110286236A1 (en) * 2008-10-31 2011-11-24 I2Ic Corporation Light Source with Light Recovery Mechanism
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US8256924B2 (en) 2008-09-15 2012-09-04 Ilumisys, Inc. LED-based light having rapidly oscillating LEDs
US8299695B2 (en) 2009-06-02 2012-10-30 Ilumisys, Inc. Screw-in LED bulb comprising a base having outwardly projecting nodes
US8324817B2 (en) 2008-10-24 2012-12-04 Ilumisys, Inc. Light and light sensor
US8330381B2 (en) 2009-05-14 2012-12-11 Ilumisys, Inc. Electronic circuit for DC conversion of fluorescent lighting ballast
US20120320571A1 (en) * 2011-05-23 2012-12-20 Posco Led Company Ltd. Optical semiconductor-based tube type lighting apparatus
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
US8362710B2 (en) 2009-01-21 2013-01-29 Ilumisys, Inc. Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
US8421366B2 (en) 2009-06-23 2013-04-16 Ilumisys, Inc. Illumination device including LEDs and a switching power control system
US8444292B2 (en) 2008-10-24 2013-05-21 Ilumisys, Inc. End cap substitute for LED-based tube replacement light
US8454193B2 (en) 2010-07-08 2013-06-04 Ilumisys, Inc. Independent modules for LED fluorescent light tube replacement
US8523394B2 (en) 2010-10-29 2013-09-03 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8540401B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED bulb with internal heat dissipating structures
US8541958B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED light with thermoelectric generator
US8556452B2 (en) 2009-01-15 2013-10-15 Ilumisys, Inc. LED lens
US8596813B2 (en) 2010-07-12 2013-12-03 Ilumisys, Inc. Circuit board mount for LED light tube
US8653984B2 (en) 2008-10-24 2014-02-18 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
US8674626B2 (en) 2008-09-02 2014-03-18 Ilumisys, Inc. LED lamp failure alerting system
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
US8901823B2 (en) 2008-10-24 2014-12-02 Ilumisys, Inc. Light and light sensor
US9057493B2 (en) 2010-03-26 2015-06-16 Ilumisys, Inc. LED light tube with dual sided light distribution
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US9163794B2 (en) 2012-07-06 2015-10-20 Ilumisys, Inc. Power supply assembly for LED-based light tube
US9184518B2 (en) 2012-03-02 2015-11-10 Ilumisys, Inc. Electrical connector header for an LED-based light
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
US20160139318A1 (en) * 2014-11-13 2016-05-19 Boe Technology Group Co., Ltd. Backlight module and display apparatus
US20160147005A1 (en) * 2013-07-26 2016-05-26 Sakai Display Products Corporation Lighting Device and Liquid Crystal Display Apparatus
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light
US20160356434A1 (en) * 2015-06-02 2016-12-08 Isuzu Optics Corp. Light mixing structure
US9574717B2 (en) 2014-01-22 2017-02-21 Ilumisys, Inc. LED-based light with addressed LEDs
US10161568B2 (en) 2015-06-01 2018-12-25 Ilumisys, Inc. LED-based light with canted outer walls

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8748909B2 (en) * 2006-11-03 2014-06-10 Apple Inc. Display system
CN101201147B (zh) * 2006-12-14 2012-10-10 鸿富锦精密工业（深圳）有限公司 均匀导光机构
US8169388B2 (en) * 2007-07-02 2012-05-01 Apple Inc. Color correction apparatus
KR100911463B1 (ko) * 2007-12-05 2009-08-11 최규만 면광원 장치
JP4528911B2 (ja) * 2008-10-07 2010-08-25 株式会社オプトデザイン 光源装置およびこの光源装置を用いた照明装置
CN102466168B (zh) * 2010-10-29 2014-02-19 京东方科技集团股份有限公司 线光源及液晶显示装置
JP2012164742A (ja) * 2011-02-04 2012-08-30 Showa Denko Kk 照明装置および照明装置の製造方法
CN102182968A (zh) * 2011-05-16 2011-09-14 冠捷显示科技（厦门）有限公司 新型led背光源模组
US20130201156A1 (en) * 2012-02-08 2013-08-08 Microsoft Corporation Optical touch navigation
US9784433B2 (en) * 2014-09-30 2017-10-10 The Boeing Company Optical devices for light mixing

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991070A (en) * 1989-07-12 1991-02-05 Herman Miller, Inc. Sleeve for a light element
US5255171A (en) * 1991-11-27 1993-10-19 Clark L Douglas Colored light source providing intensification of initial source illumination
US5688042A (en) * 1995-11-17 1997-11-18 Lumacell, Inc. LED lamp
US5921652A (en) * 1995-06-27 1999-07-13 Lumitex, Inc. Light emitting panel assemblies
JP2000036209A (ja) 1998-07-17 2000-02-02 Matsushita Electric Ind Co Ltd 線状光源およびそれを用いた液晶表示装置
US6186649B1 (en) * 1998-04-16 2001-02-13 Honeywell International Inc. Linear illumination sources and systems
US20020080622A1 (en) * 2000-12-21 2002-06-27 Philips Electronics North America Corporation Faceted multi-chip package to provide a beam of uniform white light from multiple monochrome LEDs
US6874924B1 (en) * 2002-03-14 2005-04-05 Ilight Technologies, Inc. Illumination device for simulation of neon lighting
US20050122742A1 (en) * 2003-12-02 2005-06-09 Ho Sung T. Led lamp tube
US20070058357A1 (en) * 2005-09-15 2007-03-15 Toyoda Gosei Co., Ltd. Lighting device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4411675B2 (ja) 1998-12-24 2010-02-10 パナソニック株式会社 信号表示灯
JP2002177218A (ja) 2000-12-18 2002-06-25 Asahi Optical Co Ltd 電子内視鏡用光源ユニット
US20050030729A1 (en) 2003-08-07 2005-02-10 Tia-Cheng Yu Surface emitting device

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991070A (en) * 1989-07-12 1991-02-05 Herman Miller, Inc. Sleeve for a light element
US5255171A (en) * 1991-11-27 1993-10-19 Clark L Douglas Colored light source providing intensification of initial source illumination
US5921652A (en) * 1995-06-27 1999-07-13 Lumitex, Inc. Light emitting panel assemblies
US5688042A (en) * 1995-11-17 1997-11-18 Lumacell, Inc. LED lamp
US6186649B1 (en) * 1998-04-16 2001-02-13 Honeywell International Inc. Linear illumination sources and systems
US6550942B1 (en) * 1998-04-16 2003-04-22 Alliedsignal Inc. Linear illumination sources and systems
JP2000036209A (ja) 1998-07-17 2000-02-02 Matsushita Electric Ind Co Ltd 線状光源およびそれを用いた液晶表示装置
US20020080622A1 (en) * 2000-12-21 2002-06-27 Philips Electronics North America Corporation Faceted multi-chip package to provide a beam of uniform white light from multiple monochrome LEDs
US6874924B1 (en) * 2002-03-14 2005-04-05 Ilight Technologies, Inc. Illumination device for simulation of neon lighting
US20050122742A1 (en) * 2003-12-02 2005-06-09 Ho Sung T. Led lamp tube
US20070058357A1 (en) * 2005-09-15 2007-03-15 Toyoda Gosei Co., Ltd. Lighting device

Cited By (81)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070217216A1 (en) * 2006-03-19 2007-09-20 Kazuhiro Goto Light pipe providing wide illumination angle
US8070343B2 (en) 2006-03-19 2011-12-06 Tyco Electronics Canada Ulc Light pipe providing wide illumination angle
US20090201697A1 (en) * 2006-03-19 2009-08-13 Tyco Electronics Canada Ulc Light pipe providing wide illumination angle
US7585097B2 (en) * 2006-03-19 2009-09-08 Tyco Electronics Canada Ulc Light pipe providing wide illumination angle
US20080158908A1 (en) * 2006-12-28 2008-07-03 Chunghwa Picture Tubes, Ltd. Backlight module
US7534010B2 (en) * 2006-12-28 2009-05-19 Chunghwa Picture Tubes, Ltd. Backlight module
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
US8928025B2 (en) 2007-12-20 2015-01-06 Ilumisys, Inc. LED lighting apparatus with swivel connection
US7926975B2 (en) 2007-12-21 2011-04-19 Altair Engineering, Inc. Light distribution using a light emitting diode assembly
US7712918B2 (en) * 2007-12-21 2010-05-11 Altair Engineering , Inc. Light distribution using a light emitting diode assembly
US20090161359A1 (en) * 2007-12-21 2009-06-25 Altair Engineering, Inc. Light distribution using a light emitting diode assembly
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
US8807785B2 (en) 2008-05-23 2014-08-19 Ilumisys, Inc. Electric shock resistant L.E.D. based light
US7976196B2 (en) 2008-07-09 2011-07-12 Altair Engineering, Inc. Method of forming LED-based light and resulting LED-based light
US7946729B2 (en) 2008-07-31 2011-05-24 Altair Engineering, Inc. Fluorescent tube replacement having longitudinally oriented LEDs
US8674626B2 (en) 2008-09-02 2014-03-18 Ilumisys, Inc. LED lamp failure alerting system
US8256924B2 (en) 2008-09-15 2012-09-04 Ilumisys, Inc. LED-based light having rapidly oscillating LEDs
US9635727B2 (en) 2008-10-24 2017-04-25 Ilumisys, Inc. Light and light sensor
US10973094B2 (en) 2008-10-24 2021-04-06 Ilumisys, Inc. Integration of LED lighting with building controls
US10036549B2 (en) 2008-10-24 2018-07-31 Ilumisys, Inc. Lighting including integral communication apparatus
US10182480B2 (en) 2008-10-24 2019-01-15 Ilumisys, Inc. Light and light sensor
US10342086B2 (en) 2008-10-24 2019-07-02 Ilumisys, Inc. Integration of LED lighting with building controls
US7938562B2 (en) 2008-10-24 2011-05-10 Altair Engineering, Inc. Lighting including integral communication apparatus
US9585216B2 (en) 2008-10-24 2017-02-28 Ilumisys, Inc. Integration of LED lighting with building controls
US8444292B2 (en) 2008-10-24 2013-05-21 Ilumisys, Inc. End cap substitute for LED-based tube replacement light
US10560992B2 (en) 2008-10-24 2020-02-11 Ilumisys, Inc. Light and light sensor
US10571115B2 (en) 2008-10-24 2020-02-25 Ilumisys, Inc. Lighting including integral communication apparatus
US10713915B2 (en) 2008-10-24 2020-07-14 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US9398661B2 (en) 2008-10-24 2016-07-19 Ilumisys, Inc. Light and light sensor
US9353939B2 (en) 2008-10-24 2016-05-31 iLumisys, Inc Lighting including integral communication apparatus
US10932339B2 (en) 2008-10-24 2021-02-23 Ilumisys, Inc. Light and light sensor
US8653984B2 (en) 2008-10-24 2014-02-18 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US10176689B2 (en) 2008-10-24 2019-01-08 Ilumisys, Inc. Integration of led lighting control with emergency notification systems
US8251544B2 (en) 2008-10-24 2012-08-28 Ilumisys, Inc. Lighting including integral communication apparatus
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US11073275B2 (en) 2008-10-24 2021-07-27 Ilumisys, Inc. Lighting including integral communication apparatus
US8324817B2 (en) 2008-10-24 2012-12-04 Ilumisys, Inc. Light and light sensor
US11333308B2 (en) 2008-10-24 2022-05-17 Ilumisys, Inc. Light and light sensor
US8901823B2 (en) 2008-10-24 2014-12-02 Ilumisys, Inc. Light and light sensor
US9101026B2 (en) 2008-10-24 2015-08-04 Ilumisys, Inc. Integration of LED lighting with building controls
US8946996B2 (en) 2008-10-24 2015-02-03 Ilumisys, Inc. Light and light sensor
US20110286236A1 (en) * 2008-10-31 2011-11-24 I2Ic Corporation Light Source with Light Recovery Mechanism
US8556452B2 (en) 2009-01-15 2013-10-15 Ilumisys, Inc. LED lens
US8664880B2 (en) 2009-01-21 2014-03-04 Ilumisys, Inc. Ballast/line detection circuit for fluorescent replacement lamps
US8362710B2 (en) 2009-01-21 2013-01-29 Ilumisys, Inc. Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
US8330381B2 (en) 2009-05-14 2012-12-11 Ilumisys, Inc. Electronic circuit for DC conversion of fluorescent lighting ballast
US8299695B2 (en) 2009-06-02 2012-10-30 Ilumisys, Inc. Screw-in LED bulb comprising a base having outwardly projecting nodes
US8421366B2 (en) 2009-06-23 2013-04-16 Ilumisys, Inc. Illumination device including LEDs and a switching power control system
US8540401B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED bulb with internal heat dissipating structures
US9395075B2 (en) 2010-03-26 2016-07-19 Ilumisys, Inc. LED bulb for incandescent bulb replacement with internal heat dissipating structures
US8840282B2 (en) 2010-03-26 2014-09-23 Ilumisys, Inc. LED bulb with internal heat dissipating structures
US9057493B2 (en) 2010-03-26 2015-06-16 Ilumisys, Inc. LED light tube with dual sided light distribution
US9013119B2 (en) 2010-03-26 2015-04-21 Ilumisys, Inc. LED light with thermoelectric generator
US8541958B2 (en) 2010-03-26 2013-09-24 Ilumisys, Inc. LED light with thermoelectric generator
US8454193B2 (en) 2010-07-08 2013-06-04 Ilumisys, Inc. Independent modules for LED fluorescent light tube replacement
US8596813B2 (en) 2010-07-12 2013-12-03 Ilumisys, Inc. Circuit board mount for LED light tube
US8523394B2 (en) 2010-10-29 2013-09-03 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8894430B2 (en) 2010-10-29 2014-11-25 Ilumisys, Inc. Mechanisms for reducing risk of shock during installation of light tube
US8870415B2 (en) 2010-12-09 2014-10-28 Ilumisys, Inc. LED fluorescent tube replacement light with reduced shock hazard
US20120320571A1 (en) * 2011-05-23 2012-12-20 Posco Led Company Ltd. Optical semiconductor-based tube type lighting apparatus
US9016890B2 (en) * 2011-05-23 2015-04-28 Posco Led Company Ltd. Optical semiconductor-based tube type lighting apparatus
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US9184518B2 (en) 2012-03-02 2015-11-10 Ilumisys, Inc. Electrical connector header for an LED-based light
US9163794B2 (en) 2012-07-06 2015-10-20 Ilumisys, Inc. Power supply assembly for LED-based light tube
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US10278247B2 (en) 2012-07-09 2019-04-30 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9807842B2 (en) 2012-07-09 2017-10-31 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US10966295B2 (en) 2012-07-09 2021-03-30 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
US20160147005A1 (en) * 2013-07-26 2016-05-26 Sakai Display Products Corporation Lighting Device and Liquid Crystal Display Apparatus
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
US10260686B2 (en) 2014-01-22 2019-04-16 Ilumisys, Inc. LED-based light with addressed LEDs
US9574717B2 (en) 2014-01-22 2017-02-21 Ilumisys, Inc. LED-based light with addressed LEDs
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light
US20160139318A1 (en) * 2014-11-13 2016-05-19 Boe Technology Group Co., Ltd. Backlight module and display apparatus
US9977175B2 (en) * 2014-11-13 2018-05-22 Boe Technology Group Co., Ltd. Backlight module and display apparatus
US10161568B2 (en) 2015-06-01 2018-12-25 Ilumisys, Inc. LED-based light with canted outer walls
US10690296B2 (en) 2015-06-01 2020-06-23 Ilumisys, Inc. LED-based light with canted outer walls
US11028972B2 (en) 2015-06-01 2021-06-08 Ilumisys, Inc. LED-based light with canted outer walls
US11428370B2 (en) 2015-06-01 2022-08-30 Ilumisys, Inc. LED-based light with canted outer walls
US20160356434A1 (en) * 2015-06-02 2016-12-08 Isuzu Optics Corp. Light mixing structure

Also Published As

Publication number Publication date
JP4404799B2 (ja) 2010-01-27
KR100807605B1 (ko) 2008-02-28
US20060221619A1 (en) 2006-10-05
TWI339296B (en) 2011-03-21
KR20060106898A (ko) 2006-10-12
JP2006286512A (ja) 2006-10-19
CN1847956A (zh) 2006-10-18
TW200639526A (en) 2006-11-16
CN100526953C (zh) 2009-08-12

Similar Documents

Publication Publication Date Title
US7350952B2 (en) Illumination system and display device using the same
KR100830072B1 (ko) 조명 장치 및 조명 장치를 이용하는 ｌｃｄ 디바이스
KR100771324B1 (ko) 면 조명 장치 및 그것을 구비한 액정 표시 장치
US6566689B2 (en) Illumination system and display device
KR101113236B1 (ko) 다이나믹한 영상을 위한 백라이트 유닛 및 이를 채용한디스플레이 장치
US6854854B2 (en) Illumination system and display device
JP4577229B2 (ja) バックライト装置及び液晶表示装置
US20050007753A1 (en) Compact illumination system and display device
CN101268720A (zh) 广源控制设备、照明设备和液晶显示设备
JP2006024439A (ja) 面状光源装置
KR100719737B1 (ko) 백라이트 장치 및 액정 표시 장치
JP2006236701A (ja) バックライト装置及び液晶表示装置
US6690349B2 (en) Scrolling backlight system for LCD TV
JP2006228576A (ja) バックライト装置及び液晶表示装置
KR20050121578A (ko) 백라이트 유닛
KR20060010224A (ko) 백라이트 어셈블리 및 이를 갖는 표시장치
WO2014201785A1 (zh) 一种背光模组和显示装置
JP4775195B2 (ja) 面光源装置
JP4760048B2 (ja) バックライト装置及び液晶表示装置
JP2009009739A (ja) カラー液晶表示装置
WO2012002065A1 (ja) バックライトユニットおよび液晶表示装置
JP2006058483A (ja) 液晶表示用バックライト装置及び透過型液晶表示装置
JP5130613B2 (ja) バックライト装置及び液晶表示装置
JPWO2013094480A1 (ja) 照明装置、シーリングライト、バックライト、液晶表示装置、及びテレビジョン受信装置
US7832915B2 (en) Surface light source device and image display unit

Legal Events

Date Code Title Description
AS Assignment

Owner name: NEC LCD TECHNOLOGIES, LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NISHIGAKI, EITARO;REEL/FRAME:017667/0702

Effective date: 20060303

Owner name: NEC LCD TECHNOLOGIES, LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NISHIGAKI, EITARO;REEL/FRAME:018033/0354

Effective date: 20060303

STCF Information on status: patent grant

Free format text: PATENTED CASE

AS Assignment

Owner name: NEC CORPORATION,JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NEC LCD TECHNOLOGIES, LTD.;REEL/FRAME:024492/0176

Effective date: 20100301

Owner name: NEC CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NEC LCD TECHNOLOGIES, LTD.;REEL/FRAME:024492/0176

Effective date: 20100301

FPAY Fee payment

Year of fee payment: 4

AS Assignment

Owner name: GOLD CHARM LIMITED, SAMOA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NEC CORPORATION;REEL/FRAME:029991/0610

Effective date: 20121130

FPAY Fee payment

Year of fee payment: 8

MAFP Maintenance fee payment

Free format text: PAYMENT OF MAINTENANCE FEE, 12TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1553); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Year of fee payment: 12

AS Assignment

Owner name: HANNSTAR DISPLAY CORPORATION, TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GOLD CHARM LIMITED;REEL/FRAME:063351/0517

Effective date: 20230320